Sometimes the infected person was breathing heavily, for example, while singing or exercising.” A bar or restaurantĬoronavirus outbreaks at events, and in establishments such as bars and restaurants, account for an important number of contagions in social settings. These transmissions occurred within enclosed spaces that had inadequate ventilation. An article in the prestigious Science magazine found that there is “ overwhelming evidence” that airborne transmission is a “major transmission route” for the coronavirus, and the CDC now notes that, “under certain conditions, they seem to have infected others who were more than six feet away. In the spring, health authorities failed to focus on aerosol transmission, but recent scientific publications have forced the World Health Organization (WHO) and the CDC to acknowledge it. In the following example, we outlined what conditions increase the risk of contagion in this situation. Scientists have shown that these particles – which we also release into the atmosphere when simply breathing and which can escape from improperly worn face masks – can infect people who spend more than a few minutes within a five-meter radius of an infected person, depending on the length of time and the nature of the interaction. These aerosols, if not diffused through ventilation, become increasingly concentrated, which increases the risk of infection. This is because speaking in a loud voice releases 50 times more virus-laden particles than when we don’t speak at all. But we now know that shouting and singing in indoor, poorly ventilated spaces over a prolonged period of time also increases the risk of contagion.
Without ventilation, aerosols remain suspended in the air, becoming increasingly concentrated as time goes by.Īt the beginning of the pandemic, it was believed that the large droplets we expel when we cough or sneeze were the main vehicle of transmission.
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